#map-block {
  filter: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg"><filter id="g"><feColorMatrix type="matrix" values="0.3 0.3 0.3 0 0 0.3 0.3 0.3 0 0 0.3 0.3 0.3 0 0 0 0 0 1 0"/></filter></svg>#g');
  -webkit-filter: grayscale(100%);
  filter: grayscale(100%);    
  filter: progid:DXImageTransform.Microsoft.BasicImage(grayScale=1);
}